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DP83256 bảng dữ liệu(PDF) 71 Page - Texas Instruments

tên linh kiện DP83256
Giải thích chi tiết về linh kiện  PLAYER(TM) Device (FDDI Physical Layer Controller)
PDF  146 Pages
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nhà sản xuất  TI1 [Texas Instruments]
Trang chủ  http://www.ti.com
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DP83256 bảng dữ liệu(HTML) 71 Page - Texas Instruments

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50 Registers (Continued)
526 CURRENT INJECTION COUNT REGISTER (CIJCR)
The Current Injection Count Register takes a snap-shot of the Injection Counter during every Control Bus Interface read cycle of
this register
During a Control Bus Interface write cycle the Control Bus Write Command Reject bit (CCR) of the Interrupt Condition Register
(ICR) will be set to 1 and will ignore a write cycle
The Injection Counter is an 8-bit down-counter which decrements every 80 ns
The counter is active only during One Shot or Periodic Injection Modes (ie Injection Controlk10l bits (ICk10l)ofthe
Current Transmit State Register (CTSR) are set to either 01 or 10)
The Injection Threshold Register (IJTR) value is loaded into the Injection Counter when the counter reaches zero and during
every Control Bus Interface write cycle of IJTR
The counter is initialized to 0 during the reset process (ie ERSTeGND)
ACCESS RULES
ADDRESS
READ
WRITE
19h
Always
Write Reject
D7
D6
D5
D4
D3
D2
D1
D0
IJC7
IJC6
IJC5
IJC4
IJC3
IJC2
IJC1
IJC0
Bit
Symbol
Description
D0 – D7
IJC0 – IJC7
INJECTION COUNT BITk0-7l
Current value of the Injection Counter
IJC0 is the Least Significant Bit (LSB)
70



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